You could heat them with one heater if you put the jars in a larger tub filled partially with water. The water in the large tub can be safely heated and the warm water would transfer into warming the fish, making the yucky bloom go away(and keeping the bettas warmer and healthier) while only costing one heater

You could heat them with one heater if you put the jars in a larger tub filled partially with water. The water in the large tub can be safely heated and the warm water would transfer into warming the fish, making the yucky bloom go away(and keeping the bettas warmer and healthier) while only costing one heater

I used to live in TX and had the luxury of being able to keep bettas without heaters because of the temperature... except during winter.
During colder months.. when I had 30+ bettas I would use the method mentioned by purplemuffin for some of the fish and for others I would put them under heating lamps... kept them nice and warm!

No problem! Its just basically like floating a betta and acclimating them to water..only you're floating a lot of them, and not putting them in the big tub! Heat lamps work good too! I agree! :D Just make sure to watch the temps

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